#include <REGX52.H>

void Delay(unsigned int xms);	//@12.000MHz
unsigned int LEDNum;
void main()
{
	P2=~0x01; 
	while(1)
	{
		if(P3_1==0)
		{
			Delay(20);
			while(P3_1==0);
			Delay(20);
			LEDNum++;
			if(LEDNum>=8)
				LEDNum=0;
			P2=~(0x01>>LEDNum);
		}
	}
}
void Delay(unsigned int xms)	//@12.000MHz
{
	while(xms--)
	{
		unsigned char data i, j;

		i = 12;
		j = 169;
		do
		{
			while (--j);
		} while (--i);
	}
	
}